1) ttl zoom flashlight 2) i-ttl for nikon or e-ttl ii for canon 3) guide number:gn35(iso100, 35mm);gn50(iso100, 180mm) 4) fast recycling time:2s(full power output, 4*aa ni-mh batteries) 5) 24-180 manual zoom 6) s1/s2 flash mode(support for multiple lamp lighting system) 7) overheating protection(comes with the temperature detection system) 8) lcd display led-backlit 9) 22 level manual light quantity output control system 10) dual slave focus lamp 11) for nikon, canon, olympus & pentax 12) iso9001 & iso4000 Digital camera flash gun
